Investigators believe Australians were among the clients of Peter Gerard Scully, the Melbourne man whose alleged sex crimes against babies and children in the Philippines have renewed calls for the south-east Asian country to reintroduce the death penalty.

A 13 year-old girl from an impoverished family, who has emerged as Scully's latest alleged victim, has told police she was supposed to meet one of his Australian clients and perform lewd sex acts in front of a camera.

But the girl said plans were changed at the last minute and Scully instead tried to sell her to a German man for the equivalent of $2924.

She told police when she heard she was going to be sold she ran away from Scully's rented house.

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Australian Federal Police investigating Scully's alleged online streaming of depraved child pornography videos suspect some of his international clients were in Australia.

AFP agents travelled to the Philippines last week where police have seized videos showing the 13 year-old girl being forced to perform lewd acts with a baby aged one and girl toddler aged five.

Police have described the video as the most shocking child pornography that has been discovered in the Philippines in living memory.

The video shows whipping and torture as well as depraved acts.

The girl was one of at least eight of Scully's alleged victims who are co-operating in the police investigation along with two of his former teenage live-in partners who were also former alleged victims.

She told police she agreed to work for "Uncle Peter" because he told her mother he would pay for her schooling.

"Because (he) pay a big amount that's why I had to do that," the girl said, referring to acts she was forced to perform.

Police believe Scully abused more than a dozen children over three years in the Philippines, moving house frequently and employing at least four foreign accomplices and half a dozen Filipino workers in a lucrative "pay for view" online child pornography business.

A Fairfax Media Investigation has revealed that 52 year-old Scully had an amoral past in Melbourne and arrived in Manila in 2011 while fleeing from Victorian fraud and deception offences over his key role in a property scheme that rorted more than $2.68 million from 20 investors.

Scully, a father of two, is being held in a southern Philippine jail on charges of human trafficking, murder, child abuse and rape.

Lindsay Murdoch is a three-time winner of the Walkley Award, Australia's top award for journalistic excellence. Lindsay is a former correspondent based in Singapore, Jakarta and Darwin. In 1999 he covered the tumultuous events in East Timor, and in 2003 he covered the Iraq war while embedded with US Marines.